Viewing Issue Advanced Details
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
08577 Color/Palette Minor Always Mar 3, 2023, 21:21 Mar 8, 2023, 02:25
Tester ICEknight View Status Public Platform MAME (Official Binary)
Assigned To Resolution Open OS Windows 10/11 (64-bit)
Status [?] Confirmed Driver
Version 0.252 Fixed in Version Build 64-bit
Fixed in Git Commit Github Pull Request #
Summary 08577: gx4000, cpc6128p, cpc464p: Green monitor selection only changes background color
Description Emulation of the "Plus" series of Amstrad CPC machines has a bug under "Machine Configuration", where selecting the "GT64 Green Monitor" only changes the background color to green.
Steps To Reproduce -Load the gx4000 driver with any game
-Menu, Machine Configuration, Monitor -> GT64 Green Monitor
-If you go back to selecting the other monitor, the background color will change to an also incorrect grey shade.
Additional Information The cpc464 driver behaves correctly.
Github Commit
Regression Version
Affected Sets / Systems gx4000,cpc6128p,cpc464p
Attached Files
png file icon pang.png (11,676 bytes) Mar 3, 2023, 21:21 Uploaded by ICEknight
gx4000 pang
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Senior Tester
Mar 3, 2023, 23:32

Selecting the GT64 monitor makes the background green instead of the foreground. Changing it back to CTM640 makes the background grey.
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Senior Tester
Mar 5, 2023, 09:50
the plus machines have their own dynamic palette, so it's easy to see why this happens.
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Mar 5, 2023, 20:42
I wonder what a CPC Plus would actually display on a GT64, the Plus range had their own monochrome and colour monitor. While you could connect a GT64 or CTM640 to a Plus, you'd also get no sound, as the speaker was moved from the base unit, to the monitor. The Pluses should really have their own, separate monitor options.
User avatar
Mar 8, 2023, 02:25
You can still connect some amplifiers to the Plus' headphone jack, same as you can do when connecting other systems like the Spectrum +2A and a +3 (which, by the way, look amazing on a CTM644).

I guess that the ideal scenario would be to give all systems access to any device with compatible connectors (Vas is doing a great job with the controllers in this regard), and assign to each monitor device their respective features, such as the green/amber tint, adjustment knobs, additional displays, etc, instead of having them depend on the system's driver.